Adult: Distinguished from all other species of the proteus-group by yellow-and-black pattern, which forms bands across the head and not more than a single yellow patch on each fore wing (see figure below). Dark specimens of this species resemble males of Clastoptera testacea from above, but differ in their facial markings, which include a black band across the upper part of the face in C. proteus, but not in testacea. (1)

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